钢筋混凝土框架结构连续落层倒塌的混沌特征

英文篇名：Chaotic Features of Progressive Storey Collapse of RC Frame Structures
中文刊名：工程抗震与加固改造
英文刊名：Earthquake Resistant Engineering and Retrofitting
作者：贾浩华 ; 魏德敏
英文作者：Jia Hao-hua1 ; 2 ; Wei De-min2(1.State Key Laboratory of Subtropical Building Science ; South China University of Technology ; Guangzhou 510640 ; China ; 2.China Construction Design International Consultants Co.ltd. ; Shenzhen 518048 ; China)
中文关键词：柱铰式薄弱层屈服 ; 连续落层倒塌 ; 屈服后负刚度 ; 非周期运动 ; 初值敏感性 ; 吸引子
英文关键词：column-plastic-hinge weak layer yield mode ; progressive storey collapse ; post-yield negative stiffness ; nonperiodic motion ; sensitive for initial status ; attractor
出版日期：2012-08-05
机构：华南理工大学亚热带建筑科学国家重点实验室;中建国际(深圳)设计顾问有限公司;
年：2012
期：04
出版单位：工程抗震与加固改造

摘要

汶川地震中钢筋混凝土框架结构破坏的主要特征为柱铰式薄弱层屈服破坏,而抗震规范所倡导的"强柱弱梁"机制未能实现。本文基于混沌理论的观点,通过分析框架结构的两种屈服模式,首次在薄弱层屈服引起连续落层倒塌的破坏过程中发现了明显的混沌特征,即具有对初始状态的敏感依赖性以及非周期运动的出现。本文引入混沌理论研究建筑震害,假定混沌运动的简单吸引子是梁、柱的塑性铰,奇怪吸引子是结构的薄弱层屈服。通过研究,提出了在主结构中增设次结构可避免出现屈服后负刚度和混沌现象的设计建议。
In Wenchuan earthquake,general fail feature of RC frame structure is column-plastic-hinge weak layer yield mode,that contradict yield behavior of 'Strong Column and Weak Beam' recommended in Chinese seismic code.Through analyzing these two yield modes based on chaotic theory,definite chaotic features of RC frame structure are detected in progressive storey collapse caused by weak layer yield.Specifically,features are sensitive dependence on initial status and appearance of nonperiodic motion(simple attractors are beam lastic-hinges and column plastic-hinges,strange attractor is yield of weak layer).Chaotic theory is introduced into research on earthquake disasters of buildings for the first time,suggestion in this paper is adding substructure to avoid appearance of post-yield negative stiffness and chaos.

引文

[1]李英民,刘立平.汶川地震建筑震害与思考[M].重庆:重庆大学出版社,2008Li Ying-min,Liu Li-ping.Building Damage and Thinkingin Wenchuan Earthquake[M].Chongqing:ChongqingUniversity Press,2008(in Chinese)
    [2]冯远,刘宜丰,肖克坚.来自汶川大地震亲历者的第一手资料—结构工程师的视界与思考[M].北京:中国建筑工业出版社,2009Feng Yuan,Liu Yi-feng,Xiao Ke-jian.Experience theWenchuan Earthquake—Structure Engineers’Point andView[M].Beijing:China Architecture&BuildingPress,2009(in Chinese)
    [3]沈聚敏,周锡元,高小旺,刘晶波.抗震工程学[M].北京:中国建筑工业出版社,2008,195～197Shen Ju-min,Zhou Xi-yuan,Gao Xiao-wang,Liu Jing-bo.Aseismic Engineering[M].Beijing:ChinaArchitecture&Building Press,2008,195～197(inChinese)
    [4][美]E.N.洛伦兹.混沌的本质[M].北京:气象出版社,1997E N Lorenz.The Essence of Chaos[M].Beijing:Meteorological Press,1997(in Chinese)
    [5]王兴元.复杂非线性系统中的混沌[M].北京:电子工业出版社,2003(in Chinese)Wang Xing-yuan.Chaos of Complex Nonlinear System[M].Beijing:Electronic Industry Press,2003(inChinese)
    [6]ASCE Standard.SEI/ASCE 7-05 Minimum Design Loadsfor Buildings and Other Structures[S].2005
    [7]马千里,陆新征,叶列平.层屈服后刚度对地震响应离散型影响的研究[J].工程力学,2008,(7):133～141Ma Qian-li,Lu Xin-zheng,Ye Lie-ping.Influence of theInter-story Post-yield Stiffness to the Variance of SeismicResponse[J].Engineering Mechanics,2008,(7):133～141(in Chinese)
    [8]Haohua Jia,Demin Wei.Basic Principal and DesignMethodology of Progressive Storey Collapse Resistance ina New Type RC Twin-frame Structure[A].Proceedingsof 2011 International Conference on Technology ofArchitecture and Structure[C],2011